Strategy to develop efficient grid system for flow analysis around two-dimensional bluff bodies

Influence of Separation Interference Method on Aerodynamic Responses of a Pentagonal Shaped Bridge Deck

“…At the domain top and bottom surface, a slip type boundary condition (∂u/∂y = 0 and v = 0) was applied. Further details of the numerical schemes used to discretize the governing equations and justification of the considered domain size can be found in Haque et al [5,12]. OpenFOAM was used as a solver in the present investigation.…”

A Parametric Study of Wind Pressure Distribution on Façades Using Computational Fluid Dynamics

“…Details of the computational domain used in simulations are given in Figure 2. For a 2D analysis, Best Practice Guidance suggests that the extent of the computational domain should be based on the depth (D) of the building in plan-view to ensure that the interaction of boundaries with the structure is minimized [12]. The chosen upstream and downstream model dimensions are based on the recommended minimum values of 5D and 10D, respectively [7,13].…”

“…The chosen upstream and downstream model dimensions are based on the recommended minimum values of 5D and 10D, respectively [7,13]. Furthermore, the distance from the top and bottom boundaries and the outside of the structure should not be less than 6D [12], and so the height of the domain was chosen to equal 13D. In terms of blockage ratio-the combined length of the building's width and the fin's depth 'd', as a proportion of the height of the domain-the assigned problem has a maximum of 7.7% (where the façade configuration has the fin connected directly to the building, 'g' = 0 mm), which satisfies the acceptable upper limit of less than 10% [6].…”

“…The size of cells required at the building surface should be less than width/100 or a reduction in scale equal of 300 times the cell size [21]. A structured mesh ( Figure 3) with a growth rate of 1.1 was used [12] to meet the demand of modeling near wall behavior by placing the smallest dimensioned cells in contact with the walls, and then applying a linearly increasing growth rate on each cell that extends further out. This factor represents an improvement on the value of 1.3 recommended in general for wind engineering [9,10].…”

“…The non-dimensional wall distance, Y-plus (Y + ), is an important measure of mesh quality at wall features within the computational domain. For values less than 5, modeling takes account of turbulence dampening at the viscous sub-layer [12]. However, with the application of WMLES, turbulence was resolved directly at wall regions where Y + < 300 [23,24].…”